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Presumptive Republican nominee Donald Trump will have his own wall to face in the presidential election: the "Blue Wall," according to NBC News.

The election is decided by a handful of key states that sit on the political fence between either party. The "Blue Wall" describes the eighteen states and the District of Columbia that have voted for a Democratic candidate since 1992, accounting for 242 electoral votes, only 28 votes shy of the 270 they needed to win. That gives Democrats plenty of room for error.

Republicans, on the other hand, have consistently won only 13 states over that same period, for a total of 102 electoral votes. Trump needs to win both Florida and Ohio, or he needs flip long-held Democratic states like Pennsylvania.